US9906356B2 - Timer synchronizing system in loop communication channel - Google Patents
Timer synchronizing system in loop communication channel Download PDFInfo
- Publication number
- US9906356B2 US9906356B2 US15/372,799 US201615372799A US9906356B2 US 9906356 B2 US9906356 B2 US 9906356B2 US 201615372799 A US201615372799 A US 201615372799A US 9906356 B2 US9906356 B2 US 9906356B2
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- timer
- communication frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors
- H04L7/0033—Correction by delay
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
Definitions
- the present disclosure relates to a timer synchronizing system for a communication system in a loop communication channel, in which timers connected to slave stations in the communication channel are time synchronized with a high degree of accuracy.
- FIG. 6 shows a block diagram of a timer synchronizing system according to a conventional technique.
- two communication channels are used to connect a master station 1 with slave stations 2 and 4 and connected between slave stations, to thereby establish bidirectional communication.
- the master station 1 transmits a communication frame from a transmission/reception circuit 13 to the slave station 2 .
- the slave station 2 receives the communication frame in a transmission/reception circuit 26 , and transmits the communication frame to a slave station 3 from the transmission/reception circuit 26 .
- the slave station 3 receives the communication frame in a transmission/reception circuit 36 and transmits the communication frame to the slave station 4 from the transmission/reception circuit 36 .
- the slave station 4 receives the transmission frame in a transmission/reception circuit 46 and transmits the communication frame to the master station 1 from the transmission/reception circuit 46 . In this way, loop communication is established.
- Timer correcting sections 23 , 33 , and 43 owned by the slave stations correct corresponding slave station timers 24 , 34 , and 44 based on timer correction times.
- FIG. 7 shows a flowchart of a process for setting a timer correction time during initialization of the master and slave stations in the conventional technique.
- Each of the slave stations waits until a communication frame addressed to the slave station itself is received (S 51 ).
- the slave station After receiving the communication frame addressed to the slave station itself, the slave station transmits the received communication frame to a transmission source located upstream of the slave station (S 52 ) and also transmits the communication frame to another slave station or the master station located downstream of the slave station (S 53 ). Then, the downstream slave or master station waits for the transmission frame transmitted in S 52 and S 53 (S 54 ), and sets the timer correction time upon receipt of the communication frame (S 55 ).
- a timer correction time Ts is calculated based on both a communication frame transmission time To in S 53 and a communication frame reception time Tr in S 54 by the following Equation 1.
- Ts ( To ⁇ Tr )/2 (Equation 1)
- FIG. 8 shows a block diagram of the slave station according to another example of the conventional technique.
- a transmitter/receiver 203 outputs received communication frame data.
- a transmission destination determining circuit 205 determines whether or not the communication frame data are addressed to its own slave station, and outputs, based on the determined result, a relay/reload switching signal SW-b.
- a relay/reload switch 206 outputs transmission data 210 through a communication frame reloading circuit 208 when the received transmission frame data are addressed to its own slave station, or outputs through a relaying circuit 207 the received transmission frame data without processing when the received communication frame data are addressed to another station.
- the transmitter/receiver 203 outputs, as a communication frame, the data output by the relay/reload switch 206 to a next station.
- the communication frame reloading circuit 208 outputs, based on the received communication frame data, the timer correction value to the timer correcting unit 23 . Based on the timer correction value, the timer correcting section 23 corrects the slave station timer 24 in the slave station in which the timer correcting section 23 is installed.
- FIGS. 9 and 10 show flowcharts of a process to set the timer correction time in the master station and the slave station according to the conventional technique.
- the master station 1 transmits to the slave stations 2 , 3 , and 4 a communication frame that contains timer correction time information obtained by summing up the correction values for synchronizing the timers and delay times caused by relay/reload processing in transit slave stations in the loop communication channel (S 40 ).
- process steps performed in the slave station 2 are explained as an example.
- the slave station 2 switches the relay/reload switch 206 (see FIG.
- the slave station 2 swiftly switches the relay/reload switch 206 to a relaying circuit side to become ready to perform a process of relaying the communication frame to another slave station (S 42 ).
- the timer correcting unit 23 (see FIG. 8 ) corrects the slave station timer 24 in the slave station 2 based on the timer correction time information contained in the communication frame (S 43 ).
- the master station 1 completes initialization when the communication frame including information indicative of completion of timer correction is received from all of the slave stations (S 44 ).
- times of the slave stations can be synchronized with the time of the master station in the loop communication channel even when the communication delay occurs due to relay/reload processing in each of the slave stations. In this way, accurate timer synchronization can be achieved even in communication accompanying the process of relaying/reloading the communication frame.
- Patent Literature 1 JP S61-6953 A
- Patent Literature 2 JP H10-164109 A
- the conventional technique shown in FIGS. 6 and 7 is based on the premise that two communication channels are used for connection between the master station 1 and the slave stations 2 and 4 and between the slave stations, to thereby enable bidirectional communication.
- this raises a problem in that costs are increased due to the necessity of the two communication channels for each connection between the stations.
- There is another problem in that because a measurable communication lag time is only an average of lag times in the two communication channels, the resulting measurement of the lag times is inaccurate.
- the conventional technique also suffers from a further problem in that the delay times caused by the relay/reload processing in the slave stations are not accurately obtained.
- the present disclosure advantageously provides timer synchronization between a master station and slave stations with a high degree of accuracy while reducing costs associated with communication channels through which the master and slave stations are connected.
- the present disclosure relates to a timer synchronizing system for synchronizing timers of a plurality of slave stations in a specific communication frame, the system having a master station, the plurality of slave stations, and a loop communication channel through which the master station and the slave stations are connected.
- the master station includes a master station timer that measures, for each of the slave stations, a transmission lag time from transmission of the communication frame from the master station in a forward direction through the loop communication channel until the master station receives the communication frame which is returned along a backward direction through the communication channel from each of the slave stations having received the communication channel, a delay information storage unit that stores delay time information indicative of delay times taken to perform processing on the communication frame in the slave stations, a timer correction time calculator that calculates, based on both the transmission lag time measured for each of the slave stations and the delay time information, timer correction times, each of which corresponds to one of the slave stations, and a transmitter that transmits each of the timer correction times to corresponding one of the slave stations.
- each of the slave stations includes a transmission/reception switch that switches a direction of transmitting/receiving the communication frame between the forward direction and the backward direction, and a timer correcting unit that corrects a timer in each of the slave stations based on corresponding one of the timer correction times which is associated with the each of the slave stations and transmitted from the master station.
- the delay times taken to perform processing on the communication frame in the slave stations include a relay delay time taken to perform a process of relaying the communication frame to another one of the slave stations and a reload delay time taken to perform a process of reloading the communication frame which is to be returned to the master station, the reload delay time being different from the relay delay time.
- the timer correction time calculator calculates the timer correction time for the intended one of the slave stations based on the transmission lag times measured for the slave stations, the relay delay times that occur in one or more of the slave stations located between the master station and the intended one of the slave stations in the loop communication channel viewed along the forward direction, and the reload delay time that occurs in the intended one of the slave stations.
- timer synchronization between the master station and the slave stations can be achieved with a high degree of accuracy while reducing costs associated with a communication path on which the master station and the slave stations are connected.
- FIG. 1 is a block diagram showing an embodiment of the present disclosure
- FIG. 2 is a block diagram showing a master station according to the embodiment of the present disclosure
- FIG. 3 is a block diagram showing a slave station according to the embodiment of the present disclosure.
- FIG. 4 is a flowchart showing process steps performed by the master station according to the embodiment of the present disclosure.
- FIG. 5 is a flowchart showing process steps performed by the slave station according to the embodiment of the present disclosure.
- FIG. 6 is a block diagram showing a conventional technique
- FIG. 7 is a flowchart showing process steps performed by a master/slave station in the conventional technique
- FIG. 8 is a block diagram showing the slave station according to another example of the conventional technique.
- FIG. 9 is a flowchart showing process steps performed by the master station in the another example of the conventional technique.
- FIG. 10 is a flowchart showing process steps performed by the slave station in the another example of the conventional technique.
- FIG. 1 shows a block diagram of a timer synchronizing system according to an embodiment of the present disclosure.
- FIG. 1 or below-described FIGS. 2 and 3 components having the same functions as those in components according to a conventional example (shown in FIG. 6 or FIG. 8 ) are identified with identical reference numerals to those in FIG. 6 or 8 , and the descriptions related to the components will not be repeated.
- a single communication channel is used to connect between a master station 1 and slave stations 2 and 4 , and between slave stations. In this way, costs associated with the communication channel are reduced relative to those associated with a communication channel in the prior art.
- the master station 1 transmits a communication frame from a transmission/reception circuit 13 to the slave station 4 in addition to performing conventional loop communication for transmitting the communication frame from the master station 1 to the slave station 2 .
- the slave station 4 receives in a transmission/reception circuit 42 the communication frame, and transmits the communication frame from the transmission/reception circuit 42 to a slave station 3 .
- the slave station 3 receives in a transmission/reception circuit 32 the communication frame, and transmits the communication frame from the transmission/reception circuit 32 to the slave station 2 .
- the slave station 2 receives in a transmission/reception circuit 22 the communication frame, and transmits the communication frame from the transmission/reception circuit 22 to the master station 1 . In this way, bidirectional loop communication is performed by means of the single channel.
- FIG. 2 shows a block diagram of the master station in the timer synchronizing system according to this disclosure.
- a transmitter/receiver 203 is connected via a transmission/reception switch 201 to a forward transmission side communication channel which is a communication path established along a forward direction in the loop communication channel (the communication path directed to the slave station 2 in the example of FIG. 1 ).
- a transmitter/receiver 204 is connected via a transmission/reception switch 202 to a backward transmission side communication channel which is a communication path established along a backward direction in the loop communication channel (the communication path directed to the slave station 4 in the example of FIG. 1 ).
- the transmitter/receiver 203 has an input circuit and an output circuit, with a connection to the forward transmission side communication channel switched between the input circuit and the output circuit by the transmission/reception switch 201 .
- the transmitter/receiver 204 has an input circuit and an output circuit, with a connection to the backward transmission side communication channel switched between the input circuit and the output circuit by the transmission/reception switch 202 .
- the transmission/reception switches 201 and 202 switch the connections based on a switching signal SW-c sent from a transmission/reception controller 211 .
- the transmission/reception switch 201 connects the forward transmission side communication channel to the output circuit in the transmitter/receiver 203
- the transmission/reception switch 202 connects the backward transmission side communication channel to the input circuit in the transmitter/receiver 204 . That is, in this situation, the master station 1 outputs the communication frame to the forward transmission side communication channel and receives the communication frame from the backward transmission side communication channel.
- the transmission/reception switch 201 connects the forward transmission side communication channel to the input circuit in the transmitter/receiver 203
- the transmission/reception switch 202 connects the backward transmission side communication channel to the output circuit in the transmitter/receiver 204 .
- this condition allows the master station 1 to output the communication frame to the backward transmission side communication channel and receive the communication frame from the forward transmission side communication channel.
- the transmission/reception controller 211 outputs, to a master station timer 12 , information indicative of a transmission time and a reception time of the communication frame.
- the master station timer 12 measures a length of time from the transmission time to the reception time, and outputs time measurement data indicative of the measured length of time to an initialization data calculator 11 .
- the initialization data calculator 11 calculates and outputs a correction time for each of the slave stations based on both predetermined delay time information stored in a storage unit (not illustrated) of the master station 1 and the time measurement data received from the master station timer 12 , the predetermined delay time information representing a delay time taken to perform a process of relaying/reloading the communication frame in each of the slave stations.
- the transmission/reception controller 211 controls the communication frame stored in transmission data 210 .
- FIG. 3 shows a block diagram of the slave station in the timer synchronizing system according to this embodiment.
- the transmitter/receiver 203 is connected via the transmission/reception switch 201 to the backward transmission side communication channel (which is, in the example of the slave station 2 , the communication path toward the master station 1 ).
- the transmitter/receiver 204 is connected via the transmission/reception switch 202 to the forward transmission side communication channel (which is, in the example of the slave station 2 , the communication path toward the slave station 3 ).
- the transmission/reception switches 201 and 202 are also switched in the slave station based on a switching signal SW-a output from a transmission destination determining circuit 205 . More specifically, when the transmission/reception switches 201 and 202 receive the “H” level as the switching signal SW-a, the transmission/reception switch 201 connects the backward transmission side communication channel to the output circuit in the transmitter/receiver 203 , while the transmission/reception switch 202 connects the forward transmission side communication channel to the input circuit in the transmitter/receiver 204 . In other words, this condition allows the slave station to output the communication frame to the backward transmission side communication channel and receive the communication frame from the forward transmission side communication channel.
- the transmission/reception switch 201 connects the backward transmission side communication channel to the input circuit in the transmitter/receiver 203
- the transmission/reception switch 202 connects the forward transmission side communication channel to the output circuit in the transmitter/receiver 204 .
- this condition allows the slave station to output the communication frame into the forward transmission side communication channel and receive the communication frame from the backward transmission side communication channel.
- a relay/reload switch 206 In response to a relay/reload switching signal SW-b, a relay/reload switch 206 outputs, when data in the received communication frame are addressed to its own slave station, the transmission data 210 via a communication frame reloading circuit 208 , or outputs via a relaying circuit 207 the data in the received communication frame without processing when the data in the received frame are addressed to another slave station.
- the transmission destination determining circuit 205 further controls the communication frame to be stored in the transmission data 210 .
- the communication frame reloading circuit 208 outputs the timer correction value to the timer correcting unit 23 based on the data in the received communication frame.
- the timer correcting unit 23 corrects a slave station timer 24 contained in its own slave station based on the timer correction value.
- FIGS. 4 and 5 show flowcharts of a process of setting the timer correction time in the master station and the slave station according to this embodiment, respectively.
- the transmission/reception controller 211 outputs the “H” level as the switching signal SW-c to the transmission/reception switches 201 and 202 .
- a P1 frame which is a communication frame for measuring the lag time, is output into the forward transmission side communication channel (i.e. toward the slave station 2 ).
- the transmission/reception controller 211 outputs the “L” level as the switching signal SW-c.
- the master station 1 is turned into a state of readiness to receive, from the forward transmission side communication channel, the communication frame that has been sent from the slave station in a backward direction (S 1 ).
- the slave station 2 determines whether or not the received frame is a P2 frame (S 12 ), which will be described below.
- the received frame is the P1 frame
- operation moves to step 2 .
- the transmission destination determining circuit 205 outputs the “H” level as the switching signal SW-a and also outputs the “H” level as the switching signal SW-b.
- circuitry is switched to send the P1 frame to the timer correcting unit 23 , and turned into a state capable of transmitting the communication frame toward the backward transmission side communication channel (the communication path toward the master station 1 ).
- the transmission destination determining circuit 205 outputs the “L” level as the switching signal SW-a to re-establish a state capable of receiving the communication frame from the backward transmission side communication channel and transmitting the communication channel to the forward transmission side communication channel.
- a preparation for a process to relay the P1 frame addressed to another slave station or a preparation for a process to receive the P2 frame is made (S 3 ).
- the switching signal SW-a of the “L” level and the switching signal SW-b of the “L” level are output (i.e., the switching signals SW-a and SW-b are maintained at the “L” level), to transmit the P1 frame to the forward transmission side communication channel.
- the “H” level is assigned to the switching signal SW-a to prepare the process of relaying the P1 frame transmitted along the backward direction from another slave station (which in the example of FIG. 1 is the slave station 3 or 4 ) located on the forward transmission side of the slave station 2 (S 5 ).
- the switching signal SW-a set at the “H” level and the switching signal SW-b set at the “L” level are output, to transmit the P1 frame to the backward transmission side communication channel. In other words, processing to return the P1 frame is performed. Subsequent to this, the switching signal SW-a set at the “L” level is output to prepare the process of relaying the P1 frame or the process of receiving the P2 frame (S 7 ).
- the master station 1 measures each length of time from transmission of the P1 frame to the slave stations until the master station receives the P1 frame returned from the slave stations by means of the master station timer 12 , and outputs the measured lengths as time measurement data.
- the initialization data calculator 11 respectively calculates timer correction times for the slave stations based on both the predetermined delay times taken to perform the process of relaying/reloading the communication frame in the slave stations and the time measurement data (S 9 ).
- the master station 1 transmits the P2 frame to all of the slave stations (S 11 ).
- the slave stations receive the P2 frame and prepare the process of receiving a P3 frame.
- the master station 1 transmits the P3 frame including information indicative of the timer correction times to each of the slave stations (S 13 ).
- the slave stations When the slave stations receive the P3 frame addressed to the slave stations themselves, respectively (S 14 ), the slave stations output the switching signal SW-b set to the “H” level and the switching signal SW-a set to the “L” level, and accordingly get ready to perform the process of relaying the P3 frame addressed to another one of the slave stations or perform communication along the forward direction (S 15 ).
- the initialization is complete.
- Td12 represents an amount of lag time from transmission at the master station 1 to reception at the slave station 2
- Td2 represents an amount of delay time taken to perform in the slave station 2 the process of relaying/reloading the communication frame
- Td21 represents an amount of lag time from transmission at the slave station 2 to reception at the master station 1 .
- Td2 which is determined depending on a circuit and a program, can be previously measured and set with high accuracy. Therefore, a timer correction time Ts2 for the slave station 2 is set to a value obtained by the following Equation 3.
- Ts 2 ( T 12 ⁇ Td 2)/2 (Equation 3)
- T 13 Td 12+ Td 2+ Td 23+ Td 3+ Td 32+ Td 2+ Td 21 (Equation 4)
- Td23 represents an amount of lag time from transmission at the slave station 2 to reception at the slave station 3
- Td3 represents an amount of delay time taken to perform in the slave station 3 the process of relaying/reloading the communication frame
- Td32 represents an amount of lag time from transmission at the slave station 3 to reception at the master station 1 .
- the amount Td3, which is determined depending on the circuit and the program, can be previously measured and set with high accuracy, while the sum of the amounts Td12, Td2, and Td21 is already obtained as the amount T12 of time by Equation 2. Therefore, a timer correction time Ts3 for the slave station 3 is set to a value obtained by the following Equation 5.
- Ts 3 ( T 13 ⁇ T 12+ Td 2 ⁇ Td 3)/2 (Equation 5)
- the timers can be synchronized between the master station and the slave stations with a high degree of accuracy and without being affected by the transmission lags that differ depending on the communication paths between the master station and the slave stations.
- timer synchronization can be achieved using such PHY chips at low costs in a minimized packaging area.
- the process of relaying the communication frame and the process of reloading the communication frame may take different amounts of time depending on the circuit and the program.
- the amount T12 of time from transmission to reception of the P1 frame in the master station 1 is expressed by the following Equation 6.
- T 12 Td 12+ Td 2 c+Td 21 (Equation 6)
- Td12 represents the amount of lag time from transmission at the master station 1 to reception at the slave station 2
- Td2c represents an amount of delay time taken to perform in the slave station 2 the process of reloading the communication frame
- Td21 represents the amount of lag time from transmission at the slave station 2 to reception at the master station 1 .
- Td2c which is determined depending on the circuit and the program, can be previously measured and set with high accuracy. Therefore, the timer correction time Ts2 for the slave station 2 is set to a value obtained by the following Equation 7.
- Ts 2 ( T 12 ⁇ Td 2 c )/2 (Equation 7)
- T 13 Td 12+ Td 2 b+Td 23+ Td 3 c+Td 32+ Td 2 b+Td 21 (Equation 8)
- Td2b represents an amount of delay time taken to perform in the slave station 2 the process of relaying the communication frame
- Td23 is the amount of lag time from transmission at the slave station 2 and reception at the slave station 3
- Td3c is an amount of delay time taken to perform in the slave station 3 the process of reloading the communication frame
- Td32 represents the amount of lag time from transmission at the slave station 3 to reception at the master station 1 .
- timer synchronization can be achieved between the master station and the slave stations with high accuracy.
Abstract
Description
Ts=(To−Tr)/2 (Equation 1)
T12=Td12+Td2+Td21 (Equation 2)
Ts2=(T12−Td2)/2 (Equation 3)
T13=Td12+Td2+Td23+Td3+Td32+Td2+Td21 (Equation 4)
Ts3=(T13−T12+Td2−Td3)/2 (Equation 5)
T12=Td12+Td2c+Td21 (Equation 6)
Ts2=(T12−Td2c)/2 (Equation 7)
T13=Td12+Td2b+Td23+Td3c+Td32+Td2b+Td21 (Equation 8)
Ts3=(T13−T12+Td2c−Td3c)/2 (Equation 9)
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JP2015240367A JP2017108280A (en) | 2015-12-09 | 2015-12-09 | Timer synchronization system for ring communication path |
JP2015-240367 | 2015-12-09 |
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JP7231489B2 (en) * | 2019-06-07 | 2023-03-01 | 日清紡マイクロデバイス株式会社 | Data transmission method and data transfer device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS616953A (en) | 1984-06-21 | 1986-01-13 | Fujitsu Ltd | Timer correcting system |
JPH10164109A (en) | 1996-12-02 | 1998-06-19 | Okuma Mach Works Ltd | Timer synchronizing device in ring communication path and initializing method |
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JPH10210108A (en) * | 1996-11-20 | 1998-08-07 | Okuma Mach Works Ltd | Communication controlling method and device |
JP4337834B2 (en) * | 2006-03-28 | 2009-09-30 | ヤマハ株式会社 | Audio network system with audio sample shift correction function |
JP5504706B2 (en) * | 2009-06-23 | 2014-05-28 | 富士電機株式会社 | Network system and network system synchronization method |
CN103812589A (en) * | 2012-11-09 | 2014-05-21 | 中国科学院沈阳计算技术研究所有限公司 | Time synchronization method based on double ring bus |
-
2015
- 2015-12-09 JP JP2015240367A patent/JP2017108280A/en active Pending
-
2016
- 2016-12-05 DE DE102016123425.7A patent/DE102016123425A1/en not_active Withdrawn
- 2016-12-07 CN CN201611117041.4A patent/CN106877962A/en active Pending
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS616953A (en) | 1984-06-21 | 1986-01-13 | Fujitsu Ltd | Timer correcting system |
JPH10164109A (en) | 1996-12-02 | 1998-06-19 | Okuma Mach Works Ltd | Timer synchronizing device in ring communication path and initializing method |
US6185217B1 (en) | 1996-12-02 | 2001-02-06 | Okuma Corporation | Timer synchronizing device and initializing method for use in ring communication path |
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DE102016123425A1 (en) | 2017-06-14 |
JP2017108280A (en) | 2017-06-15 |
US20170170949A1 (en) | 2017-06-15 |
CN106877962A (en) | 2017-06-20 |
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